Valve-actuating mechanism



Aug. 12, 1924. 1,504,496

' M. PECK VALVE ACTUATING MEGHANI SM Filed Oct. 25, 1922 WITNESSES INVENTOR Mat l lynrhan P k A TTOR/VEYS Patented Aug. 12, 1924.

"varies MYRTIAN PEL'K, OE NASHVILLE, TENNESSEE.

VALVE-ACTUATING MECHANISM.

Application filed (Jctober 23, 1922." Serial No. 596,450.

To all whom it may concern:

Be it known that I, MYRTIAN Pack, a citizen of the United States, and a resident of Nashville, in the county of Davidson and State of Tennessee, have invented certain new and useful Improvements in Valve- Actuating Mechanism, of which the following is a specification. My invention relates to mechanisms for actuating overhead valves of internal combustion engines, of that class in which a rocker arm is employed to transmit motion from a push rod to the stem of an overhead valve, and it consists in the combinations, constructions and arrangements herein de scribed and claimed.

' An object of my invention is to eliminate the usual noise and rattlingincident to the contact of an end portion of the rocker arm 20 by the push rod of a valve actuating mechanism of the character described.

A'further object of the invention is to provide a valve actuating mechanism of the character described in. which the intermittently contactingportions of the push rod and a rocker arm move into and out of con tact with each other in a bath of lubricant, whereby the Contact thereof is attended by very little noise, if any, and wear on the relatively moving contact portions is practically eliminated.

Other objects and advantages will be ap parent from the following description, considered in conjunction with the accompanying drawings, forming a part of this application, in which- Figure 1 is a view mainly in side elevation and partly in vertical section, showing one embodiment of the invention, and

Figure 2 is a view similar to Figure 1 showing another embodiment of the same invention.

Referring' now to Figure 1, I show a rocker arm 1 fulcrumed intermediate its ends upon a horizontal pivot 2 and having a tappet end portion 3 fashioned with a flat lower face flying in a horizontal plane and adapted to engage the upper end of a spring pressed valve stem 5.

50 The other end of the rocker arm 1 is provided adjacent to its extremity with a depending boss or enlarged portion 6 which is adapted to enter the chamber 7 of a cup section 8 of a vertically disposed push rod which is designated generally at 9. The

push rod alsoincludes a rod or stem section 10, the upper portion of which is screw threaded for engagement with an internally threaded axially extending socket 11 in a stem portion 12 of the cup section 8, the socket 11 and the chamber 7 being axially aligned with each otherand the chamber 7 being located above the socket 11. With the arrangement described, the cup section 8 is adjustably supported on the rod section and may be held in set or adjusted position through the agency of a lock nut 13 which threadedly engages the lower portion of the stem 12 and tends to constrict the latterto an extent sufficient to cause binding between the threads of the rod section 10 and the socket 11.

As stated, the embossed end portion 6 of the rocker arm is adapted to enter the open upper end of the chamber 7; A contact element 14 has the form of a ball and is partially received in a central socket or cavity 15 in the lower or horizontal face of the end portion 6, the contact element being secured to the end portion 6 in any suitable known manner to move with the latter and to thus be inefiiect an integral part thereof. As shown, a portion of the contact element 14 depends belowv the plane of the end portion '6 'andthis depending portion has a convex surface adapted to 'aconcave central depression 16 in the bottom wall of the chamber 7, the arrangement being such that the depending portion of the contact element it will engage with the concave cavity or depression 16 while the lower face of the end portion 6 is spaced from the bottom wall of the chamber.

The chamber 7 is adapted to receive a. suitable lubricant, such as cup grease and the relatively moving contact element 14 and bottom wall of the chamber 7 will thus move in lubricated condition into and out of contact with each other, thereby preventing any appreciable wear on these parts and eliminating the noise heretofore incident to the contact of similar parts in valve actuating mechanisms of the class described.

From the foregoing description of the various parts of the device, the operation thereof may be readily understood.

In actual practice the push rod will be actuated in any usual manner, as by means of cams (not shown) to move intermittently in the direction of its length to an extent suflicient to operate the rocker arm. Since 7 the chamber 7 is open at its upper end, and

the cup section8 is vertically disposed, the

scription of the form of the device exhibited in Figure '2 to the parts thereof which difier in detail from correspondingparts ofthe :torm'of the device which has been heretofore described.

' In the second form ofthe device, the de- 7' pending boss6 of the rocker arm 1 is relal tively long and is' fashioned to be partially spherical at "its lower end and to have 'a convex lower surface, as indicated at '20.

, Theylower end portion of the boss 6 constitutes the contact element and is adapted to move within the chamber 21 of a cup section 22 of the push rod 9, the cup section 22 being identical in essential respects with the cup section 8 which has been heretofore described. The bottom of the chamber 21"has a central concave depression 23 there 'in' adapted to receive the convex lower portion'20 of'the boss 6. -The chamber 21' is adapted tore ceive 'alubricant in which the lower end portion 20 of the boss 6 moves when the push rod 9 is raised to occasion the *engagement ofthe contact element 20 with the socket or cavity 23 and tooperate I the rockerarm 1.

Obviously, my invention is susceptible of embodiment in forms other than'those il-- lustrated in the accompanying drawings and g I :thereforeconsider as my own all modifications and adaptations thereof which. fairly fall within the scope of the appended claims.

I claim 1. In a valve actuating mechanism of the character described, a push rod having at its upper end a cup section formed with a chamber open at the upper end of the cup section, said chamber being adapted to receive a lubricantand having a central concave depression in its bottom wall, and a rocker arm fulcrumed intermediate its ends and having a depending end portion adapted to enter the chamber of said cup section and provided with a contact element having a convex lower part adapted to engage with the concave depression in the bottom wall of said chamber.

2. In a valve actuating mechanism of the character described, a push rod having at its upper end a cup section formed with a chamber open at the upper end of the cup section, said chamber being adapted to receive a lubricant and having a central c011- cave depression in its bottom wall, said depression being of less area than the area of the bottom wall, and a rocker arm fulcrumed intermediate its ends and having at one end a depending boss disposed in overlying relation to the chamber of said cupsection and adapted to enter the latter, and a contact element carried by the boss in position to 'depend below the lower end of the latter, said contact element having the lower part thereof convexly curved and adapted to'engage with the concave depression in the bottom wall of the cup section to space the adjacent end of the boss from the bottom wall of the cup section.

MYRTIAN PECK. 

